Robert A. Heinlein
  • I never learned from a man who agreed with me.

  • An armed society is a polite society. Manners are good when one may have to back up his acts with his life.

  • One of the sanest, surest, and most generous joys of life comes from being happy over the good fortune of others.

  • Love is that condition in which the happiness of another person is essential to your own... Jealousy is a disease, love is a healthy condition. The immature mind often mistakes one for the other, or assumes that the greater the love, the greater the jealousy.

  • Sex without love is merely healthy exercise.